Insulated Framing. Weyerhaeuser has introduced a line of framing material designed to reduce thermal bridging. ILevel TJ Insulated headers, rim boards, and corners - sized to fit 2x6 framing - contain a substantial layer of insulating foam. R-values range from R-10 for the rim board to R-30 for the corner board. The company declined to provide pricing. Weyerhaeuser Co., 888/453-8358,

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